linux-kernel - Re: [RFC PATCH v1 02/10] KVM: s390: Honor storage keys when accessing guest memory

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Date:   Thu, 20 Jan 2022 11:27:43 +0100
From:   Christian Borntraeger <borntraeger@...ux.ibm.com>
To:     Janosch Frank <frankja@...ux.ibm.com>,
        Janis Schoetterl-Glausch <scgl@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>
Cc:     Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [RFC PATCH v1 02/10] KVM: s390: Honor storage keys when accessing
 guest memory



Am 18.01.22 um 15:38 schrieb Janosch Frank:
[...]
> /*
> We'll do an actual access via the mv instruction which will return access errors to us so we don't need to check here.
> */

Be slightly more verbose I guess. Something like
We'll do an actual access via the mv instruction which will return access errors to us so we don't need to check here.
By using key 0 all checks are skipped and no performance overhead occurs.

?

>> +    rc = guest_range_to_gpas(vcpu, ga, ar, gpas, len, asce, mode, 0);